Subjective testing was performed by volunteers in PM's test lab who observed bulbs hidden behind a white shade.
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Readings for color temperature, color rendering and spectral distribution were taken with an Ocean Optics USB2000 Miniature Fiber Optic Spectrometer, provided and calibrated by SpectrEcology of Jasper, Ga. This results in less faithful reproduction of colors, expressed as a diminished color rendering index (CRI). The modern LED version of the old incandescent lamp has a luminous efficacy equal to 92lm/W and uniformity of light. A CFL, and to a lesser extent an LED, mimics incandescents using a different mixture of light, with spikes and troughs of power strategically positioned across the spectrum to create a correlated-or averaged-color temperature. Can you stand much heat when sitting under light fixture with incandescent light bulbs in summer Are you annoying or hurt by other brand flicker/buzzing led light bulbs. An incandescent bulb achieves its temperature by emitting light over a smooth curve, with the balance tilted toward yellow and red.
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A 5500-K bulb, however, will not necessarily produce the same light as the sun for the full nature of a light source, one must look to its spectral power distribution (SPD) curve, which describes its irradiance across the entire visible spectrum. Daylight, at 5500 K, is much whiter and bluer.
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The color temperature of a light, measured in kelvins, is its most noticeable characteristic.